Ensure assigns are copied to the template when using render :update. Closes #3620.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3497 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

 *SVN*
 
+* Ensure that the instance variables are copied to the template when performing render :update. [Nicholas Seckar]
+
 * Add the ability to call JavaScriptGenerator methods from helpers called in update blocks. [Sam Stephenson]  Example:
   module ApplicationHelper
     def update_time

actionpack/lib/action_controller/base.rb

@@ -642,6 +642,9 @@ def render(options = nil, deprecated_status = nil, &block) #:doc:
             end
 
           elsif options[:update]
+            add_variables_to_assigns
+            @template.send :evaluate_assigns
+            
             generator = ActionView::Helpers::PrototypeHelper::JavaScriptGenerator.new(@template, &block)
             render_javascript(generator.to_s)
 

actionpack/test/controller/new_render_test.rb

@@ -194,6 +194,15 @@ def update_page
       page.visual_effect :highlight, 'balance'
     end
   end
+  
+  def update_page_with_instance_variables
+    @money = '$37,000,000.00'
+    @div_id = 'balance'
+    render :update do |page|
+      page.replace_html @div_id, @money
+      page.visual_effect :highlight, @div_id
+    end
+  end
 
   def action_talk_to_layout
     # Action template sets variable that's picked up by layout
@@ -223,7 +232,7 @@ def determine_layout
              "render_with_explicit_template",
              "render_js_with_explicit_template",
              "render_js_with_explicit_action_template",
-             "delete_with_js", "update_page"
+             "delete_with_js", "update_page", "update_page_with_instance_variables"
     
           "layouts/standard"
         when "builder_layout_test"
@@ -494,6 +503,14 @@ def test_update_page
     assert_equal 2, @response.body.split($/).length
   end
   
+  def test_update_page_with_instance_variables
+    get :update_page_with_instance_variables
+    assert_template nil
+    assert_equal 'text/javascript', @response.headers['Content-Type']
+    assert_match /balance/, @response.body
+    assert_match /\$37/, @response.body
+  end
+  
   def test_yield_content_for
     get :yield_content_for
     assert_equal "<title>Putting stuff in the title!</title>\n\nGreat stuff!\n", @response.body